Qureshi Ayman, Guan Tianyue, Alfano Marco
Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
Materials (Basel). 2022 Dec 31;16(1):391. doi: 10.3390/ma16010391.
The adherends notching technique has been the subject of a few recent studies and consists of tailoring the geometry of the adjoined layers to mitigate the bondline peak stresses and enhance the joint strength. In the present study, we explored the effect of the adherends notching technique on crack propagation using finite element (FE) simulations based on the cohesive zone model (CZM) of fracture. Double cantilever beam (DCB) adhesive joints subjected to quasistatic loading were considered as a model material system. An array of equally spaced notches was placed on the faying sides of the adherends, oriented perpendicularly to the direction of crack growth. A parametric investigation was carried out to ascertain the role of the notches and the input cohesive properties on various performance metrics, e.g., load-displacement response and dissipated energy. The proposed notching strategy promotes an unstable crack pinning/depinning process, which effectively delays crack growth and increases the effective work of fracture. Additionally, we found that the overall behaviour is tunable by changing geometric (i.e., notch spacing and depth) and bondline material properties.
被粘物开槽技术是最近一些研究的主题，该技术包括调整相邻层的几何形状，以减轻粘结线峰值应力并提高接头强度。在本研究中，我们基于断裂的内聚区模型（CZM），使用有限元（FE）模拟研究了被粘物开槽技术对裂纹扩展的影响。承受准静态载荷的双悬臂梁（DCB）粘结接头被视为一种模型材料体系。在被粘物的贴合面上设置一系列等间距的槽口，其方向垂直于裂纹扩展方向。进行了参数研究，以确定槽口和输入的内聚性能对各种性能指标的作用，例如载荷-位移响应和耗散能量。所提出的开槽策略促进了不稳定的裂纹钉扎/解钉扎过程，这有效地延迟了裂纹扩展并增加了断裂的有效功。此外，我们发现通过改变几何参数（即槽口间距和深度）和粘结线材料性能，可以调节整体行为。
